diff --git a/package-lock.json b/package-lock.json
index 21aae6d9f2..cc0029d2c7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
 	"name": "WordPress",
-	"version": "5.8.0",
+	"version": "5.9.0",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
diff --git a/package.json b/package.json
index ccd526066e..534763dd51 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "WordPress",
-	"version": "5.8.0",
+	"version": "5.9.0",
 	"description": "WordPress is open source software you can use to create a beautiful website, blog, or app.",
 	"repository": {
 		"type": "svn",
diff --git a/src/wp-includes/version.php b/src/wp-includes/version.php
index ef98124bea..9965b10a72 100644
--- a/src/wp-includes/version.php
+++ b/src/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-RC1-51270-src';
+$wp_version = '5.9-alpha-51272-src';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.